Airtel — Sim card issued on someone whom I don't know

Sir,
My name is sarojani bisht and I am using my this phone number from last 7-10 years and in year 2021 I port the sim to airtel on a retail store in lohaghat, Champawat with my own aadhar card but on 22 February I received a SMS that I need to submit the KYC in order to get my Re - verification done but when I tried to submit my aadar card for that my request was rejected so I researched about it and got to know that my number is registered on someone 'Har Govind Singh' whom I never met from last 1 week I am trying to get this phone number back but I can't, I need this number back as it is used in all of my documents and is used from more than 3 years.

Details of the phone number

Number- [protected]
Alternate number- [protected]